import random
# 无参无返回值
def say_hello():
    print("Hello")


# 无参有返回值
def get_rand():
    return random.randint(10,100)

# 有参无返回值
def say_hi(name):
    print("你好",name)


# 有参有返回值
def sum(a,b):
    return a+b


say_hello()
print(get_rand())
say_hi("zhangsan")
print(sum(3,6))
